red02Hawk

iTrader: (9)

hey guys need some opinions here, i have reached a crucial part of my build. I measured my clearances yesterday and here is what i came out with:
mains .0015
Rods .0015

Are these too tight? Or would i just have to run a 5w30 or a 0w oil. Need some experienced ppls opinions

JPH

iTrader: (2)

To tight for my liking. If they are a "coated" bearings, you will gain alittle more clearance after usuage, but I would remeasure or order .001 extra bearings.

red02Hawk

iTrader: (9)

I was wanting to have .002 on the mains, and .0025 on the rods. Yeah the rod bearings are coated. Can i just get the rods resized?

JPH

iTrader: (2)

Might be cheaper just to use different beraings, insteading of altering rod.

DAVESS02

iTrader: (30)

I was about the same place you are 2 weeks ago. I searched every post I could find to get an idea. Most were about .002 mains and up to .0025 on the rods with an aluminum block. With an iron block they were running a bit more on the mains. Remember, you'll gain .001 on the mains if you're running an aluminum case so if your mains get to .0025 on an LS1, you'll be at .0035 at op temp. I went with a set on the rods that gave me .0022 and .0018-.002 on the mains. I'm running an aluminum LS2 block. IMO, its also very important to plastigage and look for taper across the bearing surface. If you have .0018 across most of the face but have .0012 towards the fillet or radius, thats too tight and you'll have to clearance the bearing there. Also, just because a block is line honed or bored doesnt mean the bearing is 100%. Check for signs that the crank isnt binding at the sides of the bearings and also seat the thrust bearing before torquing everything down. If all your mains are showing .0015 or more and you cant turn the crank easy by hand and you've lubed the bearings with oil, somethings not right. Look for shiny spots on the bearings.